I was thinking of putting a set on my car. I have a few questions about them I would like to ask you guys.

1. Will normal valve springs fit on them? I read only a certain type fit on them. How about the comp cams 981's?

2. Do they require a special length pushrod?

3. Is there a big increase in power over the TPI center bolt heads?

4. Any problems you incountered while installing them? Thanks.

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1986 CAMARO Z28 ->
151,000 original miles, 43,000 on 89' vette 350 block, Holley 650 DP, Weiand intake, 1.6 rockers, 1 5/8" headers, no cat, 2 1/2" Flowmaster catback, Mallory coil, March pulleys, T5 with 3.35 1st gear and 0 miles, 90% Centerforce clutch, 3.73 posi, Eibach 1" drop springs, Spohn LCA's, Spohn adjustable panhard rod, Subframe connectors, polyurethane swaybar bushings/endlinks, 2 12" Sound Streams, 2 Infinity 6X9's, 2 Pioneer 6X9's, 800 watt Lanzar Vibe amp. ET 13.22@ 106.4MPH 3300lbs less driver and speakers Next mods-> B&M shifter, Extreme Energy 230/236 cam, Holley street dom intake.

1987 TRANS AM ->
73,000 miles, 305TPI, auto, all stock.

 

1 - not sure, sorry
2 - No, if you have flat lifters get pre 86 rods, if roller get after 87 rods
3 - Yes, as to how much increase I'm not sure. I do know that they were designed with the LT1 in mind though.
4 - As long as you have the right manifold you'll be fine. I would suggest getting a vortec specific manifold because of the port design of the vortecs. The only problem you might come to is that your accessory brakets may not fit perfectly, but it would be because of the intake manifold and not the heads. All mounting locations on the heads are the same.

It's been a while since I did my swap so I've forgotten some stuff. Hope I helped.

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88 firebird formula
350 Vortec TBI
214int/224exh, .471int/.491exh
Edelbrock headers
SIX-speed
open 3.73's
2 1/4 stock catback
I love pissing those LS1's off
My Formula

All your base are belong to us.

 

what valve springs are you using? The stock ones? If they are aftermarket which ones are you using and how much did they cost?

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1986 CAMARO Z28 ->
151,000 original miles, 43,000 on 89' vette 350 block, Holley 650 DP, Weiand intake, 1.6 rockers, 1 5/8" headers, no cat, 2 1/2" Flowmaster catback, Mallory coil, March pulleys, T5 with 3.35 1st gear and 0 miles, 90% Centerforce clutch, 3.73 posi, Eibach 1" drop springs, Spohn LCA's, Spohn adjustable panhard rod, Subframe connectors, polyurethane swaybar bushings/endlinks, 2 12" Sound Streams, 2 Infinity 6X9's, 2 Pioneer 6X9's, 800 watt Lanzar Vibe amp. ET 13.22@ 106.4MPH 3300lbs less driver and speakers Next mods-> B&M shifter, Extreme Energy 268 cam, Holley street dom intake.

1987 TRANS AM ->
73,000 miles, 305TPI, auto, all stock.

 

I'm using the stcok springs. Some say I'm over their limit, some say I'm just under, but they seem to be just fine for my cam.

------------------
88 firebird formula
350 Vortec TBI
214int/224exh, .471int/.491exh
Edelbrock headers
SIX-speed
open 3.73's
2 1/4 stock catback
I love pissing those LS1's off
My Formula

All your base are belong to us.